Feed regulating device for sewing machines



July 28, 1936. KUCERA I 2,048,874

FEED REGULATING DEVICE FOR SEWING MACHINES Filed Feb. 5, 1934 3Sheets-Sheet l J1ly 28, 1936. F. A. KUCERA FEED- REGULATING DEVICE FORSEWING MACHINES I 3 Sheets-Sheet 2 Filed Feb. 5, 1934 July 28, 1936. F,KUCERA 2,048,874

FEED REGULATING DEVICE FOR SEWING MACHINES Filed Feb 5, 1934 3Sheets-Sheet 3 Patented July 28, .1936

PATENT *QFHC'E s FEED ."REGULATING DEVICE: FOR

SEWING MACHINES '1 Frank? A.".Kucera, Chicago, 111.; 'assignor to UnionSpeciahMachine C'ompanyjChicago} 111., a cor- --poi-a;tion or IllinoisApplication February 5, 1934;..Serial No; v109,859

" 7 Claims.

..-The: invention relates to: :-new-;-.and r-useful improvements in a,feed regulating device for. sewing machines, and: more 'particularlytoga feed r regulating device; which includes a:crank:-.shiftable:radially ofthe: actuating; shaft-.ztherefor .for

-varying the throw-f a.-feed-bar.

.aAn. obi ect of-..thezinventinn is .to provide zmeanswhichris-mountedeonand'rotatingewith the shaft, -but1whichis.-\capab1e-.of-. adjustmentweccentrically l0 about-theshaft:for-positively shifting the posi- T tion.- rofethe -..crank spin whichimparts the :feed s-throw-ytoa.--feed bar.

..A .-further lobjectiof. theinvention is =to=provide means rotatingwiththe shaft for indicating the extentzofadjustment and thestitchlengthiwhich is derived from a-.-set.- adjustment.

t In the:drawings Figure ls israrr endwiew of a sewing machine =.having:theimprovements applied' thereto;

x :Fig.=2 a planwiew of .the partseheneath the cloth plate with asection 0f thecloth plate turneda-to open positionasoeasLto. expose:said parts immediatelyr-therebeneath;

.-'. Fig; 3 is a---perspective view :of the regulator 525 -;"capwhich-shiftsthecrank-pin. impartingra feed nthrow to :the feed: dog;

frEigx-e is a-face view-ofasaid rregul-atort'cap; Fig; 5.--isa:vertical. sectional view. through the 'I' end;- of the actuating: shaft,1 the crank :pingthe T39 ..link. associated. therewith. and theregulato-rcap; Fig; 6 is'a-sectional 'view-ion :the line 6'-6 of Fig.5,the actuatinglink- -being omitted;

Fig. 'l' isa face-view -ofathe regulato-recappn anfenlargedcscale; alsoshowing; the crank. and.

15. 5 :the: parts-associated therewith, with the cap set 1 in:ariposition :ior the: maximum :throw- 1 of: the crank;

1'Fig:.s -is-arviewsimilar.to.-Fig. 7,- -zwith the cap shifted so as tobring thecrankrpin.substantially 940 to: aposition ofxminimum' throw;

::Fig.-:9 is'a plan view rofcthe actuating shaft 1.- and; the:partswcarried'thereby :including aiipor- '.:tionof the-=sleeve carriediby the crank pin,- and 10 .isa developmentiof .the peripheral surfaceof: the: regulator capeshowing the 'gauging groove formed therein Pfonindicating the stitch lengths.

Thesinvention isiapplied .to'- a; sewing machine shavingafeedingwmechanisme'which. includesa 3:50 feedzbarsmovable @back: andforthior imparting ---.a';feed -throw-to. a feeds-dog. 'rTheefeed bar-isconnected to a feed rockeizcandwthe feed rocker .CiS lOSCi11abBd-}by= an:arm "which is sconnected :ithrough a :link: to as'crank mounted'fore-radial isszzadjustmentzin -the sloticarried byathe disk on .the

-- endof. the actuating shaft. Associated with. this disk is a regulatorcap whichis provided with. a spiral-islet .inthe face. thereof, andwthev crank -pin:ext'ends through this-slot. .Theslotiscf suchwidth thatwhenv the regulator capris. shifted, afterrthe. crank pinchas beenreleased,,it.wi1l positively shift said crank pin in the radialslot.

This regulator-caphas grooves-formed therein at properintervalstoindicate thestitch length which-is produced when the cap-isshiftedto a 10 certain predetermined;=position re1ative...to theactuating, shaft. Fixedwto the actuating. shaft is. a; gauge. fingerhaving. a Y zero settinggroove relative to-which the regulator cap isshifted.

nReferring rmoreqiin detail tovthedrawings, the 15 inventionisshownapplied to a-=sewingmachine which includes a supporting ..bed I.carrying ..a

- standard -2 .on which is 'mounted :an overhanging armc-arryinga'needleshead 3. A.,needlebar- 4 is mounted -for.reciprocationin theneedle head.,.- 2 0 Saidneedle. bar Acarries arneedle 5. -:Mounted onthe-.bed I is a -worktsupportt. Saidwork-support 6 is. provided-with asection I- =(see.Fig.= .2') -which-ismounted on a hinge-rodindicatedat8.

The material is I fed across the work' support bya feed-.dog'Q-carried-byethe feed-bar Hi." The feedbari-lfl is pivotedpat II to a feed-rockerl2.

The feed =rockeris mounted. =for-osci1lation--on a supporting. bar l3.The .feed rocker isoscillated by.- means of an arm I 4 which-is fixed toapin -l 5 carried; by the feed rocker. outer end. is connected :-toalinka-l 6.

The arm 4 r at. its Said -'link has 2.:piV0ta1 connection to thearmrindicated at a IT. JI'he link cooperates withasleeve |8-carried by acrank pinsl9. ..This crank-pin: l9riSPI'OVid6dp3 with aa headed,-portion 20 which-. is-.mounted. in aslot 2liformedeina disk22-1-whichisfixedwto .the main actuating-shaft indicated at -23.

-Surroundingthe disk 22 is a regulator cap-24.

said regulator .cap 24 is provided with a portion 04 extending over.the: disk 22,; and; also a front portion 24a which overlies the frontface of :-the;disk

'22. There is aslot 25 formed inthis front-lace 24a. The; crank: pin- 19=passes through ..-this slot and then extends through the sleeve l8.Mounted onzthe crank pin I 9 is a washer 1 9a. This .washer lies.between the regulator: :cap and the disk --on the;end of theshaftwhich-=carriesthe crank pin." Oneside. of the washer 19aisconcentric with the inner surface of the peripheral portion :Of .theregulatora cap. ;The---washer,v is held from rotating-about the. crankpin bya retaining pin l9b which is threaded into the headedcportion..zllof the crank pin. A nut. 26 is threaded onto ..the outerendof thecrank pin. iThis nut Engages 2,255

a washer 2'! which overlies the sleeve l8. When the nut is turned, itwill force the sleeve against the front face of the regulator cap andforce the regulator cap against the washer HM, and the washer againstthe front face of the disk carrying the crank pin. The headed portion 20of the crank pin will, of course, be drawn against the inner wall of theguiding slot therefor, and this will clamp the crank pin in a setposition. When the nut is released, then the crank pin is released foradjustment. The width of the slot 25 is substantially the same as thediameter of the crank pin. This slot is in spiral form, with one endthereof nearer the center of the disk 22 than the other end. When thenut 26 is loosened and the regulator cap shifted, it will forcibly shiftthe crank pin in the radial slot in which it is mounted to a differentset position in said slot. In other words, by shifting this regulatorcap, the eccentricity of the crank pin may be positively varied. Theperipheral surface of this regulator cap is provided with a series ofspaced grooves extending lengthwise of the cap. These grooves areindicated at a, b, 0, etc. Fixed to the disk 22 is a gauge finger 28provided with a groove or slot 29 in its outer end. When the groove 12is brought into alinement with this groove 29 in the gauge finger, thecrank pin is set at the proper eccentricity in order to produce a throwin the feed dog that will space the stitches so that there will be threeand one-half stitches per inch. If the nut 26 is released and thisregulator cap shifted while the main actuating shaft is held frommovement so that the groove a is brought into alinement with this groove29 in the gauge finger, then the crank pin is shifted to a different setposition through contact with the side edges of the spiral slot in saidregulator cap. When in this set position, then the crank pin has theproper eccentricity for imparting the throw to the feed dog whichproduces three stitches per inch. If this regulator cap is shifted tobring the groove cinto alinement with the groove 29, then four stitchesper inch will be produced, and likewise by shifting this regulator capwhen the nut 26 is' released, the crank pin maybe shifted to the propereccentricity for producing the desired stitch length which will beindicated by the graduations on this regulator cap. After the propersetting of the crank pin has been accomplished, then the nut 26 isturned so'as to lock the regulator cap and the crank pin in the desiredset position.

It will be apparent from the above that the section 1 of the cloth platemay be readily moved to open position, giving access to the nut 26 andthe regulator cap. The operator holds the shaft from turning and loosensthe nut 26, and then while the shaft is held from rotation, with thegauge finger in proper position to be viewed, the regulator cap isshifted to the stitch length which is desired to be obtained. This will]positively force the crank pin radially of the disk 22 to a set positionto give the desired stitch length.

It is obvious that minor changes in the details of construction and thearrangement of the parts may be made without departing from the spiritof the invention as set forth in the appended claims g 7 Having thusdescribed the invention, what I claim as new and desire to secure byLetters Pat- 7 ent, is-

1. In asewing machine, the combination of a feed dog, a feed barcarrying said feed dog, a

feed rocker to which said feed bar is connected, an actuating shaft,means operated by said actuating shaft for oscillating said feed rocker,said means including a crank pin carried by and adjustable radially ofsaid shaft, cam means car- 5 ried by and movable circumferentially aboutthe axis of said shaft for positively shifting said crank pin todifferent predetermined set stitch length positions, and means forlocking said crank pin in a set position.

2. In a sewing machine, the combination of a feed dog,'a feed barcarrying said feed dog, a feed rocker to which said feed bar isconnected, an actuating shaft, means operated by said actuating s aftfor oscillating said feed rocker, said means including a disk carried bysaid actuating shaft, a crank pin carried by said disk and adjustableradially thereof, and cam means carried by the disk and shiftablecircumferentially about said disk for shifting the crank pin on saiddisk to 20 different predetermined set s'titchjlengthpositions. r

3. In a sewing machine, the combination of a feed dog, a feed barcarrying said feed dog, a feed rocker to which said feed bar isconnected, an 25 actuating shaft, means operated by said actuating shaftfor oscillating said feed rocker, said means including a diskcarried'by-said shaft, a crank pin mounted on said disk for adjustmentradially thereof, a; regulator cap enclosing said 30 disk and having aspiral slot in the face thereof through whichsaid crank pin extends,said slot 'being dimensioned and shaped so that when said regulator capis shifted on said disk it will positively shift said crank pin todifferent predeter- 35 in saidslot, a sleeve on said crank, a regulatorcap having a portion extending over said disk and a front portionengaging the front face of said disk, said front portion having a spiralslot formed therein through which said crank pin extends,'saidsleevebeing adapted to bear against said front face of the regulator cap, anut adapted to be threaded onto said crank pin for securing said crankpin and said regulator cap in set positions, said regulator cap havingindicating marks on the periphery thereof, and a gauge finger carried bysaid disk for indicating set positions of the cap whereby said cap maybe turned for shifting said crank radially of the actuating shaft todifferent predetermined set stitch length positions.

5. In a sewing machine, the combination of a 60 feed dog and devices forimparting back and forth and rising and falling movements theretoincluding a rotary shaft, means for varying the extent of back and forthmovement of said feed dog including a crank pin carried by said shaft,65 said crank pin being adjustable radially thereof and devicesshiftable circumferentially about the axis of the shaft for adjustingsaid crank pin to different set radial positions and means forming apart of said crank pin for securing said 70 crank pin and the adjustingmeans therefor rigidly in adjusted position.

6. In a sewing machine, the combination of a feed dog and devices forimparting back and forth and rising and falling movements thereto 75including a rotary shaft, means for varying the extent of back and forthmovement of said feed dog including a crank pin carried by said shaft,said crank pin being adjustable radially thereof and devices foradjusting said crank pin to different set radial positions, a gaugefinger and indicating marks on the adjusting means for indicating theset positions of the crank pin and means forming a part of said crankpin for securing said crank pin and the adiusting means therefor rigidlyin adjusted position.

7. In a sewing machine, the combination of a feed dog, a feed barcarrying said feed dog, a

feed rocker to which said feed bar is connected, an actuating shaft,means operated by said actuating shaft for oscillating said feed rocker,said means including a crank pin carried by and adjustable radially ofsaid shaft, cam means carried by and rotating with said shaft forpositively shifting said crank pin to different predetermined set stitchlength positions, means for locking said crank pin in a set position andmeans rotating with said crank pin for indicating in stitched 10 lengthsthe set position of the crank pin.

FRANK A. KUCERA.

